Select last character in bottom right in select all

src/SelectionModel.test.ts

@@ -99,7 +99,7 @@ describe('SelectionManager', () => {
   describe('finalSelectionEnd', () => {
     it('should return the end of the buffer if select all is active', () => {
       model.isSelectAllActive = true;
-      assert.deepEqual(model.finalSelectionEnd, [79, 1]);
+      assert.deepEqual(model.finalSelectionEnd, [80, 1]);
     });
     it('should return null if there is no selection start', () => {
       assert.equal(model.finalSelectionEnd, null);

src/SelectionModel.ts

@@ -64,7 +64,7 @@ export class SelectionModel {
    */
   public get finalSelectionEnd(): [number, number] {
     if (this.isSelectAllActive) {
-      return [this._terminal.cols - 1, this._terminal.ybase + this._terminal.rows - 1];
+      return [this._terminal.cols, this._terminal.ybase + this._terminal.rows - 1];
     }
 
     if (!this.selectionStart) {